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Commit 210f84b0 authored by Wincy Van's avatar Wincy Van Committed by Paolo Bonzini
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x86: irq: Define a global vector for nested posted interrupts 



We are using the same vector for nested/non-nested posted
interrupts delivery, this may cause interrupts latency in
L1 since we can't kick the L2 vcpu out of vmx-nonroot mode.

This patch introduces a new vector which is only for nested
posted interrupts to solve the problems above.

Signed-off-by: default avatarWincy Van <fanwenyi0529@gmail.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a512177e

arch/x86/entry/entry_64.S

+1 −0
Original line number Diff line number Diff line
@@ -705,6 +705,7 @@ apicinterrupt X86_PLATFORM_IPI_VECTOR x86_platform_ipi smp_x86_platform_ipi 
#ifdef CONFIG_HAVE_KVM

apicinterrupt3 POSTED_INTR_VECTOR		kvm_posted_intr_ipi		smp_kvm_posted_intr_ipi

apicinterrupt3 POSTED_INTR_WAKEUP_VECTOR	kvm_posted_intr_wakeup_ipi	smp_kvm_posted_intr_wakeup_ipi

apicinterrupt3 POSTED_INTR_NESTED_VECTOR	kvm_posted_intr_nested_ipi	smp_kvm_posted_intr_nested_ipi

#endif



#ifdef CONFIG_X86_MCE_THRESHOLD

arch/x86/include/asm/entry_arch.h

+2 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ BUILD_INTERRUPT3(kvm_posted_intr_ipi, POSTED_INTR_VECTOR, 
		 smp_kvm_posted_intr_ipi)

BUILD_INTERRUPT3(kvm_posted_intr_wakeup_ipi, POSTED_INTR_WAKEUP_VECTOR,

		 smp_kvm_posted_intr_wakeup_ipi)

BUILD_INTERRUPT3(kvm_posted_intr_nested_ipi, POSTED_INTR_NESTED_VECTOR,

		 smp_kvm_posted_intr_nested_ipi)

#endif



/*

arch/x86/include/asm/hardirq.h

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ typedef struct { 
#ifdef CONFIG_HAVE_KVM

	unsigned int kvm_posted_intr_ipis;

	unsigned int kvm_posted_intr_wakeup_ipis;

	unsigned int kvm_posted_intr_nested_ipis;

#endif

	unsigned int x86_platform_ipis;	/* arch dependent */

	unsigned int apic_perf_irqs;

arch/x86/include/asm/hw_irq.h

+2 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ extern asmlinkage void apic_timer_interrupt(void); 
extern asmlinkage void x86_platform_ipi(void);

extern asmlinkage void kvm_posted_intr_ipi(void);

extern asmlinkage void kvm_posted_intr_wakeup_ipi(void);

extern asmlinkage void kvm_posted_intr_nested_ipi(void);

extern asmlinkage void error_interrupt(void);

extern asmlinkage void irq_work_interrupt(void);
@@ -62,6 +63,7 @@ extern void trace_call_function_single_interrupt(void); 
#define trace_reboot_interrupt  reboot_interrupt

#define trace_kvm_posted_intr_ipi kvm_posted_intr_ipi

#define trace_kvm_posted_intr_wakeup_ipi kvm_posted_intr_wakeup_ipi

#define trace_kvm_posted_intr_nested_ipi kvm_posted_intr_nested_ipi

#endif /* CONFIG_TRACING */



#ifdef	CONFIG_X86_LOCAL_APIC

arch/x86/include/asm/irq_vectors.h

+2 −1
Original line number Diff line number Diff line
@@ -83,7 +83,6 @@ 
 */

#define X86_PLATFORM_IPI_VECTOR		0xf7



#define POSTED_INTR_WAKEUP_VECTOR	0xf1

/*

 * IRQ work vector:

 */
@@ -98,6 +97,8 @@ 
/* Vector for KVM to deliver posted interrupt IPI */

#ifdef CONFIG_HAVE_KVM

#define POSTED_INTR_VECTOR		0xf2

#define POSTED_INTR_WAKEUP_VECTOR	0xf1

#define POSTED_INTR_NESTED_VECTOR	0xf0

#endif



/*